Fayalite-Tephroite系鉱物の加熱による相変化

概要

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The results of the thermal transformation experiments of tephroite and knebelite are presented. The materials are from the highly contact metamorphosed bedded manganese ore deposits of Tanohata, Hijikuzu and Hakozaki mines, Iwate Prefecture, Japan. The end member ratios of tephroite from Tanohata and Hijikuzu mines are Mn_2SiO_4 95.1,97.3,Mg_2SiO_4 4.9,1.5,Ca_2SiO_4 0.0,1.2mol.%, respectively and these of knebelite from Hijikuzu and Hakozaki mines are Fe_2SiO_4 30.5,68.4,Mn_2SiO_4 66.2,30.2,Mg_2SiO_4 3.3,1.5mol.%, respectively. On the heat treatment at 1100℃ in air, the X-ray patterns of tephroite from Tanohata and Hijikuzu mines showed the braunite and rhodonite lines, whereas these of Hijikuzu knebelite showed the jacobsite, rhodonite and tridymite lines. On the knebelite from Hakozaki mine after heating at 1050℃ in air, the diffraction lines corresponding to jacobsite, hematite and tridymite were observed.thermal transformationfayalite-tephroite seriesolivinetephroiteknebeliteDTA curveTG curve
東北大学の論文
1986-09-30